Figure 1. Adjusted Relative Risk (RR) of Preterm Birth by Maternal Nativity, Ethnicity, and Race .

All models were adjusted for maternal age, educational level, insurance type, prenatal care, tobacco use, hypertension, diabetes, presence of congenital anomalies in the newborn, birth year, and state of birth. Error bars represent 95% CIs.

^aIncluded birthing people who selected other race or more than 1 race.